Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

5 hosts · 243 ms

HostCertsFirst seenLast seenDNS
spk-burgenlandkreis.de 2 2025-12-22 2026-08-27 ok
psd2-xs2a.spk-burgenlandkreis.de 2 2025-07-10 2026-06-02 nxdomain
module.spk-burgenlandkreis.de 2 2026-01-09 2026-08-27 ok
mailing.spk-burgenlandkreis.de 5 2026-04-26 2026-08-24 ok
www.spk-burgenlandkreis.de 2 2026-01-09 2026-08-27 ok

Programmatic access, with DNS A records: API GET /v1/hosts/spk-burgenlandkreis.de (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/spk-burgenlandkreis.de.